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Guarantees And Contingencies (Details) (USD $)
 1 Months Ended 3 Months Ended
Jul. 31, 2009
Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
Total long-term debt obligations   $ 620,719,000
Long-term debt obligations due within one year   11,652,000
Long-term debt obligations due in second and third years   124,937,000
Long-term debt obligations due in fourth and fifth years   484,130,000
Long-term debt obligations due after fifth year   0
Total operating lease obligations   152,543,000 [1]
Operating lease obligations due within one year   8,632,000 [1]
Operating lease obligations due in second and third years   59,276,000 [1]
Operating lease obligations due in fourth and fifth years   38,883,000 [1]
Operating lease obligations due after fifth year   45,752,000 [1]
Total purchase obligations   8,488,000
Purchase obligations due within one year   1,869,000
Purchase obligations due in second and third years   5,686,000
Purchase obligations due in fourth and fifth years   933,000
Purchase obligations due after fifth year   0
Total obligations   781,750,000
Total obligations due within one year   22,153,000
Total obligations due in second and third years   189,899,000
Total obligations due in fourth and fifth years   523,946,000
Total obligations due after fifth year   45,752,000
Non-cancelable sublease income   2,100,000
EasyLink Services International Corporation [Member]
    
Loss Contingencies [Line Items]    
Litigation settlement, expense   27,000,000
Litigation settlement, expense, net of tax   16,400,000
Estimate of possible assessment   10,500,000
Amount assessed for sales tax, interest, and penalties $ 500,000  
[1] Net of $2.1 million of sublease income to be received from properties which we have subleased to third parties.